Jacobson, W. J., & Lauby, C. J. K. (1968). Thinking ahead in science. American book company.
Chicago Edition CitationJacobson, Willard J., i Cecelia J Konicek Lauby. Thinking Ahead in Science. New York: American book company, 1968.
Cita MLAJacobson, Willard J., i Cecelia J Konicek Lauby. Thinking Ahead in Science. American book company, 1968.
Atenció: Aquestes cites poden no estar 100% correctes.